Headphone



FIG. 1 is a front, top, right perspective view of a headphone showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines showing the headphone portions are unclaimed portions thereof and form no part of the claimed design. The dot-dash broken lines showing boundaries of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a headphone, as shown and described. 